Chemical Sciences Division, Office of Basic Energy Sciences of the U.S. DOE

University of Hong Kong

Hong Kong Research Grant Council

Special Administrative Region, China

7018/06P

U.S. Department of Energy's Office of Biological and Environmental Research

Funding Information:

This study was partially supported by a grant from the Chemical Sciences Division, Office of Basic Energy Sciences of the U.S. DOE and partially by the University of Hong Kong and Hong Kong Research Grant Council, Special Administrative Region, China (Project No. 7018/06P). The research described in this Article was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the U.S. Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory (PNNL). PNNL is operated by Battelle for the U.S. Department of Energy. I.K.C. and C.L. acknowledge participation in the PNNL Interfacial and Condensed Phase Summer Research Institute. We thank Mr. Tao Song (University of Hong Kong) for stimulating discussions.